Rotary pump.



PATENTED SEPT. 19, 1905.

W; s. SHARPNEGK.

RoTARY PUMP.

APPLICATION FILED NOV. 14l 1904.

if( Q/ UNITED STATES PATENT oFFIoE.

WILLIAM S. SHARPNECK, OF CHICAGO, ILLINOIS, ASSIGNOR OF THREE- FOURTHS TO FRANK A. SHARPNECK, HENRY SCHAEFFER, AND FRED- ERICK SCHAEFFER, OF CHICAGO, ILLINOIS.

ROTARY PUMP.

Speccaton of Letters Patent.

Patented Sept. 19, 1905.

Application led November 14, 1904. Serial No. 232,561.

object of the improvements is to provide means in connection with the drum of such a pump for varying the eccentricity of the drum in operation within the casing or reversing it relatively to the current in order to modify the amount or reverse the direction of the ow through the pump without changing the of the pistons.

ings, in which Figure 1 is a transverse section,taken on theV line l 1 of Fig. 2, of a pump of the class mentioned containing my invention. Fig. 2 is a longitudinal section, partly in elevation ofthe same, the section taken on the line 2 2 of Fig. 1. Fig. 3 is a transverse section on the line 3 3 of Fig. 2. Fig. 4is a detail showing a detached part in perspective. Fig. 5 is a detail showing detached parts in plan view.

In the drawings, referring to the parts, the numeral 1 designates the cylindrical casing which is provided with ports 2 at opposite points for liquid ingress and egress, said ports being located in recesses 3 in the casing interior preferably made by external enlargements of the casing at the points of their location, as shown in Fig. 1. A shaft 4, journaled in the casing and having liquid-tight closing therewith, is provided with pistons or radial wings 5, which are adapted to sweep the interior of the casing for forcing liquid through the same when rotated by means of said shaft. Said wings are provided with speed or reversing the direction of rotation I attain this object by the? means illustrated in the accompanying drawposition of extreme movement of the drum 10, having close-fitting relation with said wings and with segmental bearings 11, Fig. 1, of the drum, whereby the slots 12 of the l`drum may slide and turn slightly on the The drum is provided witha detachwings. able part 13, Fig. 4, by means of which the slots 12 may be opened at one end for entering the parts 5 and 10.

The casing 1 is preferably provided with reduced extensions 1a at the ends, and in each of these a block 14 is fitted to slide, said blocks having openings adapted to fit upon the extensions 9 ofthe drum for supporting it and permitting it to turn slightlyl Within the casing and to be moved therein toward and from the center or axis `of the shaft 4, such movement being limited by lthe stop of the part 1 onthe partl 14, so that the interior of the opening of the extension 9 is not allowed tol come in contact with the shaft 4 nor the exterior of the drum to come in contact with the interior of the casing at either side. The

in one direction is illustrated in Figs. 2 and 3, which show'the closest approach of the drum to the interior of the casing l and to the shaft 4. The blocks 14 are connected with rods 15, extended out through openings at 16 and provided with a bar 17 and lever 18, whereby said blocks may he moved back and forth within the limits of the interior of the parts 1a. The openings at 16 are extended through suicient thickness of material to serve as guides to the .movement of said rods, and a stuffing-box is provided at 19 to afford a liquid-tight closing about the rods.

The wings 5 project through the slots 12 of the drum, and the spaces 20 at the end of said slots are filled with a pair of rings 21, which fit upon the periphery of the drum and against the ends of the said wings, so as to prevent the liquid from passing them through said spaces. As seen in Figi 1, two of the wings stand in line, one projecting about half its width from the periphery of the drum and the other projecting but slightly, and two other of the wings stand at a slight angle and project equally from the drum.' The connection of the keyed wing with the hinged wings through the drum is such that each of the wings by the simple rotation of the shaft is brought to the position relatively to the drum of the one having the greatest projection there- IOO from, and this causes the liquid to be drawn in at one port and forced out at the opposite port ot' the casing. This operation is not new with the drum having a iixed eccentric position relatively to the casing and shaft; butinthe present instance the drum, being supported by the sliding blocks connected with the rods projecting out through the casing and having the lever in connection therewith, may have its eccentricity varied or change to a concentric or opposite position. When the drum is moved toward the shaft or axis of rotation without changing the speed of the shaft, the active area of the pistons or wingsl is reduced and the amount ot' liquid-throw will be lessened, but will be capable of exerting increased pressure. When the drum-axis is coincident with the axis of rotation, the active area of the several wings is equalized and there will be no throw of liquid, and when the eccentricity ot' the drum is changed to the opposite side of the casing without changing the direction of the shaft rotation the direction of the liquid-throw will be reversed.

The principle of the invention is embodied by a rotary pump having variable piston areas, whereby the throw may be increased or lessened without changing the speed of the pistons or reversible eccentricity, whereby the active piston areas may be transferred from one side of the liquid-current passing through the pump to the opposite side for reversing the direction of said current without changing the direction of rotation of the pistons.

That is claimed isl. In a rotary pump, the combination of an exterior casing, a shaft rotatable therein, pistons rotatable with said shaft and having their free ends coacting with the interior wall of said exterior casing, and a drum located in said exterior casing around said shaft and having slots therein through which said pistons project, said drum being shit'table in said exterior casing with respect to the shaft and pistons.

2. In a rotary pump, the combination of an exterior casing, a shaft rotatable therein, pistons rotatable with said shaft and havingl their free ends coacting with the interior walls or' said exterior casing, a drum Vlocated in said exterior casing around said shaft and having slots therein through which said pistons project, said drum being shiftable in said exterior casing with respect to the shaft and pistons, slidingl supports for said drum and lever connections for moving said supports and drum.

3. In a rotary pump, the combination of a casing, a driving-shaft journaled in said casing, a drum also journaled in the casing having reduced extensions and slots in its cylindrical side, pistons rotatable with said shaft and passing through said slots, sliding supports forming bearings for the reduced extensions of said drum, and means for sliding said supports and their drum with respect to said shaft and pistons.

WILLIAM S. SHARPNECK.

Witnesses:

FREDERICK SGHAEFFER, FRANK A. SHARPNECK. 

